Shovel
AssigneeSumitomo Heavy Industries, Ltd.
InventorYoshiyasu Itsuji
Life of this patent
Estimating the term…
Abstract
A shovel includes a plurality of hydraulic actuators each configured to move in response to a movement command; a pressure sensor configured to detect a pressure of hydraulic oil in each of the hydraulic actuators; a meter-in valve in correspondence with each of the hydraulic actuators; a meter-out valve in correspondence with each of the hydraulic actuators; and a controller having a plurality of output characteristics set for each of the hydraulic actuators. The controller is configured to calculate a required flow rate corresponding to the movement command, based on an output characteristic corresponding to the movement command from among the plurality of output characteristics.
Claims19
A shovel comprising:
- a plurality of hydraulic actuators each configured to move in response to a movement command;
- a pressure sensor configured to detect a pressure of hydraulic oil in each of the hydraulic actuators;
- a meter-in valve in correspondence with each of the hydraulic actuators;
- a meter-out valve in correspondence with each of the hydraulic actuators;
- and
- a controller having different output characteristics set for each of the hydraulic actuators,
- wherein the controller is configured to calculate a required flow rate corresponding to the movement command, based on an output characteristic corresponding to the movement command from among the output characteristics.
A shovel comprising:
- a hydraulic pump;
- a plurality of hydraulic actuators each configured to move in response to a movement command;
- a pressure sensor configured to detect a pressure of hydraulic oil in each of the hydraulic actuators;
- a discharge pressure sensor configured to detect a discharge pressure of the hydraulic pump;
- a meter-in valve in correspondence with each of the hydraulic actuators;
- a meter-out valve in correspondence with each of the hydraulic actuators;
- and
- a controller configured to calculate, based on the movement command, a meter-in flow rate that is a flow rate of hydraulic oil to pass through the meter-in valve and a meter-out flow rate that is a flow rate of hydraulic oil to pass through the meter-out valve,
- wherein the pressure sensor, the meter-in valve, and the meter-out valve are provided in correspondence with each of the hydraulic actuators, and
- the controller is configured to
- calculate an opening area of the meter-in valve based on the meter-in flow rate, a detection value of the pressure sensor, and a detection value of the discharge pressure sensor, and
- calculate an opening area of the meter-out valve based on the meter-out flow rate and a detection value of the pressure sensor.
A shovel comprising:
- a hydraulic pump;
- a plurality of hydraulic actuators each configured to move in response to a movement command;
- a pressure sensor configured to detect a pressure of hydraulic oil in each of the hydraulic actuators;
- a meter-in valve in correspondence with each of the hydraulic actuators;
- a meter-out valve in correspondence with each of the hydraulic actuators;
- and
- a controller configured to compare a pump flow rate that is a flow rate of hydraulic oil to be discharged from the hydraulic pump and that is calculated based on the movement command, with a maximum flow rate of hydraulic oil dischargeable from the hydraulic pump,
- wherein the pressure sensor, the meter-in valve, and the meter-out valve are provided in correspondence with each of the hydraulic actuators, and
- the controller is configured to calculate a required flow rate that is a flow rate of hydraulic oil to be supplied to each of the hydraulic actuators.
Dependencies are inferred from the claim text.